Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thien hach » thien thanh, hien hanh
thong cong » trong cong, tong cong, phong chong
manh toan » thanh toan, anh tuan, tinh toan
canh ban » can ban, canh dan, canh van
toan tap » toan ban
ban cua » ban quan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (thien hach)) - canh ban cua ((thong cong) OR (thong thong)) manh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (thien hach)) - canh ban cua ((thong cong) OR (thong thong)) manh toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (thien hach)) - canh ban cua ((thong cong) OR (thong thong)) manh toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (thien hach)) - canh ban cua ((thong cong) OR (thong thong)) manh toan tap*.